garden heliotrope vs valerian

garden heliotrope and valerian both are nouns.

Word	Noun	Adjective	Verb	Adverb
garden heliotrope	Yes	No	No	No
valerian	Yes	No	No	No

As nouns, valerian is a hypernym of garden heliotrope; that is, valerian is a word with a broader meaning than garden heliotrope:

garden heliotrope: tall rhizomatous plant having very fragrant flowers and rhizomes used medicinally
valerian: a plant of the genus Valeriana having lobed or dissected leaves and cymose white or pink flowers

garden heliotrope (noun)	valerian (noun)
tall rhizomatous plant having very fragrant flowers and rhizomes used medicinally	a plant of the genus Valeriana having lobed or dissected leaves and cymose white or pink flowers